ABSTRACT
Background Co-trimoxazole is a leading global cause of severe cutaneous adverse drug reactions (SCAR) including Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN) and drug reaction with eosinophilia and systemic symptoms (DRESS). Co-trimoxazole-induced SCAR are associated with HLA class I alleles including HLA-B*13:01 and HLA-B*38:02 in Southeast Asian (SEA) populations. However, the global generalizability of these associations is unknown but critical for population-appropriate risk stratification and diagnosis.
Objective To determine HLA risk factors associated with co-trimoxazole-induced SJS/TEN and DRESS in populations from the United States (US) and South Africa (SA).
Methods We performed high-resolution HLA typing on dermatologist-adjudicated co-trimoxazole-induced SCAR patients in the US (n=63) and SA (n=26) compared to population controls. Peptide binding and docking analyses were performed using MHCcluster2.0 and CB-Dock2.
Results In a multiple logistic regression model, HLA-B*44:03 (Pc<0.001, OR: 4.08), HLA-B*38:01 (Pc<0.001, OR: 5.66), and HLA-C*04:01 (Pc=0.003, OR: 2.50) were independently associated with co-trimoxazole-induced SJS/TEN in the US. HLA-B*44:03 was also associated with co-trimoxazole-induced DRESS in SA (Pc=0.019, OR: 10.69). Distinct HLA-B variants with shared peptide binding specificities (SPBS) and HLA-C*04:01 identified 94% and 78% of co-trimoxazole-induced SJS/TEN and DRESS in the US, respectively. The SEA risk allele HLA-B*13:01, with SPBS to HLA-B*44:03, was identified in just 1/63 US SCAR patients.
Conclusion HLA alleles with SPBS to SEA-related risk alleles including HLA-B*44:03 (SPBS with HLA-B*13:01) and HLA-B*38:01 (SPBS with HLA-B*38:02) but also HLA-C*04:01 predisposed to co-trimoxazole-induced SCAR in the US and SA. These findings provide biological plausibility and strategies for global risk prediction and diagnosis of co-trimoxazole-induced SCAR.
What is already known about this topic?HLA alleles including HLA-B*13:01 and HLA-B*38:02 are risk factors for co-trimoxazole-induced SCAR in Asian populations. However, the generalizability of these associations to other global populations is unknown but critical for population-appropriate risk stratification and diagnosis.
What does this article add to our knowledge?HLA alleles with shared peptide binding specificities (SPBS) to Asian-related risk alleles including HLA-B*44:03 (SPBS with HLA-B*13:01) and HLA-B*38:01 (SPBS with HLA-B*38:02) but also HLA-C*04:01 predisposed to co-trimoxazole-induced SCAR in the US and South Africa.
How does this study impact current management guidelines?HLA alleles previously associated with co-trimoxazole-induced SCAR do not identify risk across populations. However, HLA alleles with SPBS provide biological plausibility and strategies for global and population-appropriate clinical risk stratification and diagnosis of cotrimoxazole-induced SCAR.
Competing Interest Statement
E.J.P. receives royalties and consulting fees from UpToDate and UpToDate Lexidrug (where she is a Drug Allergy Section Editor and section author) and has received consulting fees from Janssen, Verve, Servier, Rapt and Esperion and Glenmark. E.J.P. and S.M. are co-directors of IIID Pty Ltd, which holds a patent for HLA-B*57:01 testing for abacavir hypersensitivity, and E.J.P., S.M. and A.C. hold a patent for detection of HLA-A*32:01 in connection with diagnosing drug reaction with eosinophilia and systemic symptoms to vancomycin. For these patents the authors do not receive any financial remuneration, and neither are related to the submitted work. A.M.D. receives compensation from the British Journal of Dermatology (reviewer and Editor), American Academy of Dermatology (guidelines writer), Canadian Dermatology Today (manuscript writer), National Eczema Association (consultant) and Canada's Drug Agency (consultant). All other authors declare no competing interests.
Funding Statement
This research was supported by National Institutes of Health (NIH) awards R01HG010863 (E.J.P.), NIH P50GM115305 (E.J.P.), NIH R01AI152183 (E.J.P. and J.P.), and NIH K23EY028230 (H.N.S. and E.J.P.), the NHMRC of Australia grant GNT11234999 (E.J.P.), and The Angela Anderson Fund and the SJS Research Fund (philanthropic support through VUMC) (E.J.P.). Authors also received funding from NIH U01AI154659 (E.J.P.) and NIH R21AI139021 (E.J.P.), NIH 2 D43 TW010559 (E.J.P., J.P., and R.L.), NIH K43 TW011178-01 (J.P.), NIH K08AI185260 (M.S.K.), NIH Core Grant EY001792 (H.N.S.), and an unrestricted departmental grant from Research to Prevent Blindness (H.N.S.), the AAAAI Foundation (M.S.K.), the Western Australian Future Health Research and Innovation Fund/ Western Australian Department of Health grant WANMA/EL2022/4 (A.G.), and the NHMRC of Australia grant GNT2028952 (A.G., E.J.P., and A.C.). A.M.D. has received research grants to his institution from the National Eczema Association, Eczema Society of Canada, Canadian Dermatology Foundation, Canadian Institutes for Health Research, NIH and Physicians Services Incorporated Foundation.
Author Declarations
I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained.
Yes
The details of the IRB/oversight body that provided approval or exemption for the research described are given below:
All samples and data were obtained with informed consent under institutional review board (IRB) approvals from VUMC (IRB 131836, 150754, 210027, 191350, 171900), MEEI (IRB 654182), Walter Sisulu University (HREC 056/2020), University of Cape Town (HREC R031/2018, 500/2018), Austin Health (HREC 50791/Austin-2019), and Murdoch University (HREC 2011/056, 2017/246, 2019/153). Samples and data were de-identified.
I confirm that all necessary patient/participant consent has been obtained and the appropriate institutional forms have been archived, and that any patient/participant/sample identifiers included were not known to anyone (e.g., hospital staff, patients or participants themselves) outside the research group so cannot be used to identify individuals.
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I understand that all clinical trials and any other prospective interventional studies must be registered with an ICMJE-approved registry, such as ClinicalTrials.gov. I confirm that any such study reported in the manuscript has been registered and the trial registration ID is provided (note: if posting a prospective study registered retrospectively, please provide a statement in the trial ID field explaining why the study was not registered in advance).
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Data Availability
All data produced in the present work are contained in the manuscript
- Abbreviations
- HLA
- human leukocyte antigen
- SCAR
- severe cutaneous adverse reaction
- SJS/TEN
- Stevens-Johnson syndrome and toxic epidermal necrolysis
- DRESS
- drug reaction with eosinophilia and systemic symptoms
- HIV
- human immunodeficiency virus
- PLWH
- persons living with HIV
- SEA
- Southeast Asian
- US
- United States
- SA
- South African
- SPBS
- shared peptide binding specificity
- VUMC
- Vanderbilt University Medical Centre
- MEEI
- Massachusetts Eye and Ear Institute
- ALDEN
- algorithm for drug causality in epidermal necrolysis
- HREC
- human research ethics committee
- DNA
- Deoxyribonucleic acid
- EDTA
- Ethylenediaminetetraacetic acid
- ASHI
- American society for Histocompatibility and Immunogenetics
- NATA
- National Association of Testing Authorities
- bp
- base pairs
- PDB
- protein data bank
- SMX
- sulfamethoxazole
- SMX-NO
- nitroso-sulfamethoxazole
- TMP
- trimethoprim
- OR
- odds ratio
- Pc
- corrected P value
- PPV
- positive predictive value
- NPV
- negative predictive value
- NNT
- number needed to test.





